You are conflating a conference run school administered event where the school pays the majority of the cost to an NCAA national event run by the NCAA and hosted by a university where the NCAA pays most of not al the cost.
I know you are new here, but Des Moin s also hosted the NCAA Wrestling Championships a while back.
Not all schools are Iowa, and even At Penn State and Ohio State Wrestling is big, but it is the third most popular winter sport behind Basketball and Ice Hockey.
Each school hosts the tournament in the venue that they have available. Welsh Ryan, Wisconsin Firldhouse, St. John’s Arena all have hosted Big Ten tournaments in the past and will again in the future.
Be thankful they do, there was a time not all big ten schools chose to host the event.
By the way, the Final Four this year will be in a really big stadium!
I don’t think you will see B1G at Wisconsin field house or St, Johns again and Welsh Ryan just got a major facelift so scrap that line of rationalization.